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J. R. MAR-STON.

00B AND' GRAIN MILL.

No. 23,693. Patented Apr. 19, 1859.

'we Nonms PETERS ca, pHoro-uma., wAsnmcToN, u, c.

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JOHN R. MARSTON, OF NEW YORK, N. Y.

COB AND GRAIN MILL.

Specification of Letters Patent No. 23,693, dated April 19', 1859.

To all whom it may concern:

Be it known that I, JOHN R. MAnsToN, of the city, county, and State of New York, have invented a new and useful Improvement for Graduating the Set of the Combined Cob and Grain Mill; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specification in which- Figure l is a top view of the mill Fig. 2

is a longitudinal section, Fig. 3 is a transl verse section of the grain mill, Fig. 4 is a transverse section of the Cob mill.

A is the hopper for the grain7 Z) the re` volving cone of the grain mill, C the shell of the grain mill. Z the bearings for the shaft, e the shaft, f the revolving cutter of the cob mill. g the stationary cutters and shell of the cob mill, 71. a slot in the shell of mill with a set bolt j inserted, z' collar on shaft 7a the driving pulley, Z the hopper on cob mill. m the mouth or delivery spout, n the bed plate, O the box or frame to support the mill, 79 the set screw for graduating the grain mill.

This mill is made in the ordinary form of others for this purpose, the operation of this improvement is when the sliding cone Z) requires to be graduated so as to grind coarser or liner the nut on set bolt is to be slackened and the set screw p can then be tightened or loosened as may be required, the nut on bolt j is then tightened so as to keep the cob-cutter in its proper place, the stationary cutter shell g being retained in its position by means of the revolving cutter f and the collar z' both of which are firmly secured to the shaft e by set screw or key.

l/Vhat I claim as my invention and desire to secure by Letters Patent is- The set bolt y' or its equivalents, the vslot z. in the shell of the cob cutter, and the collare' on the shaft, for the more practicable and reliable mode of retaining the cutters of the cob mill in their proper places, substantially as and for the purposes set forth.

JOHN R. MARSTON. [Ls] Signed in presence of- GEORGE D. WEST, FRED G. REOBLE. 

